Across
That island repeatedly disturbed this island (6)
I haven't cracked this one yet — but Fifteensquared have:
Anagram of THAT + twice I[sland]
Person distributing shares is fraudster if doubly so (6)
I haven't cracked this one yet — but Fifteensquared have:
A fraudster is a double dealer
Shade in US area, with same again for state (8)
I haven't cracked this one yet — but Fifteensquared have:
COLOR (US spelling of colour, shade) + A[rea] + DO (ditto, the same again)
More than once, clumsily handle fruit (6)
I haven't cracked this one yet — but Fifteensquared have:
PAW (handle clumsily) twice
Bear what is ridicule if repeated (4)
I haven't cracked this one yet — but Fifteensquared have:
Winnie the Pooh, and to ridicule is to pooh-pooh
Replacement notices changed as one result of twice dividing (10)
Cheat producing score in old notation (6-5)
I haven't cracked this one yet — but Fifteensquared have:
A score is 20, which is XX (two crosses) in Roman numerals, an “old notation”
Initially beat a retreat, then once more in German town (5-5)
I haven't cracked this one yet — but Fifteensquared have:
B[eat] A DEN (retreat), twice
Good argument for double, for example (4)
Reveal 13 (6)
With it in audition, one most like to make others double up (8)
I haven't cracked this one yet — but Fifteensquared have:
W[ith] + IT + I (one) in TEST (audition)
Continent reflected about multinational group in hot spots (6)
I haven't cracked this one yet — but Fifteensquared have:
UN (international group) in SA (South America) and its “reflection”
Doppelgänger translated from writer in German (6)
Down
Train – train endlessly, train endlessly (4-4)
Secures in carriage, sandwiched between twin sons (6)
I haven't cracked this one yet — but Fifteensquared have:
TRAP (a horse-drawn carriage) in two S[on]s
Once more show up a rep being doubly wrong (8)
I haven't cracked this one yet — but Fifteensquared have:
Two different anagrams of A REP
Lost opportunity in double withdrawal (4,2)
Moreover, encored excessively (3-3)
I haven't cracked this one yet — but Fifteensquared have:
TOO (moreover) twice; “excessively” as in Hamlet’s “O, that this too too solid flesh would melt,” though that doesn’t use a hyphen
Indication of ‘again’ verbally supported by a boy, and why (6)
I haven't cracked this one yet — but Fifteensquared have:
RE (as a prefix, an indication of “again”) + A SON
Reaffirmed commitment, thus made pillow much softer (7,4)
I haven't cracked this one yet — but Fifteensquared have:
If you double the amount of down in a pillow then it would be softer
Nobel Laureate who lyrically discouraged doublethink (3,5)
I haven't cracked this one yet — but Fifteensquared have:
A reference to the 1962 Bob Dylan song “ Don’t think twice, it’s all right ”, which was the B side of “Blowin’ in the Wind”
New members of team reorganised Sing Sing (8)
Guardian etc. added section about double (6)
Second person on computer is chasing kitty (6)
Reprimand making one sad or scared, losing head – it’s even worse in stereo? (6)
I haven't cracked this one yet — but Fifteensquared have:
A headless TEARFUL or FEARFUL – not sure about the “worse in stereo” bit
Silly ass – it follows direction repeatedly (6)
Type letters or click words in the clue