Across
Group of officers, heads of naval detachments (7)
Old Scotsman's colourful project (7)
Nice way of saying Arachne's somewhat vacuous and a bit wet (5)
It might drop me, if uninitiated in its use (9)
Expert on land usage cultivating margins, too (10)
Privileged American used to be attracted to power (4)
Of sound mind, ultimately buffered by stout optimism (12)
Inspecting, unannounced, what teenagers get up to in bathroom? (4-8)
Top copy with illiterate's signature (4)
Damn it, Twitter, you embody fatuousness! (10)
Party line developed into mutual exchange (9)
State occasion making a mint (5)
This team makes you tea (7)
Qualified agreements to rework endless subsystem (3-4)
Down
Struggle to disentangle 16 down (6)
Relating to fast, tailless fictional bloodhound (6)
Ace tenant merrily taking possession of duke's house (10)
On reflection micron's a tiny amount, in fact (5)
Bouncer quietly getting Oscar to leave club (4,5)
Destroys country house, top to bottom (4)
Admirer's agreement to marry — but not yet (8)
Wrongly enter hairdressing establishment offering health treatments (8)
Interest as founder returns to old place (10)
Freedom fighters beleaguer ill-assorted internees (9)
Radioactive element, which is used to lower cholesterol in casualty (8)
Disturbed Harry Lime's last day (8)
Copper said goodbye (3,3)
Where French children learn to core fruit (6)
Sardonically mentioning carefree fellow (5)
Perhaps the elder Turgenev gets noticed periodically? (4)
Type letters or click words in the clue