Across
15a
Albert and his work (theoretical, not real) dealt with theory of relativity? (5,2,7,4,5)
I'm going to stop working in American university (5)
How food may be served with nothing spent from monthly allowance (2,6)
It's nice to be back on road with better car (7)
Cad turned on queen and popular old king (7)
Get up around noon for wash (5)
See 1
Natural being uncovered, mask questionable — it's explained here with illustrations (4,5)
Round container holds tablet and a lot of water (5)
Article on sport that's wrong about old Louis? (7)
Returning home is largely painful for composer (7)
Could be true — look, it was 12's language (8)
Magazine love story captivates daughter (5)
Early work might involve meeting with fellow in steak bar, possibly (5,9)
Down
Keir, in short, the ablest in Labour? Nonsense! (12)
Tree, one in forest shedding bark unusually (5)
Obviously cut down on workload but forced to come in (9)
[Don't move sheep back over river] (4,3)
Meal's off — drink? (4,3)
One spearing trout-like fish — it might be easy (5)
Quite surprised — Tottenham winger during season abroad showing good form (9)
On the way to collect dope and unwilling to reconsider (12)
Eco warrior originally arrested under nuclear dump (6,3)
Stripped bird in court where defendant stands (second time covered up) (9)
Team about to board Bill's vehicle (7)
Gunners upset by a lot of Celtic's rivals — fix! (7)
FA join? That's handy! (2,3)
I win — diagram has parts missing (5)
Type letters or click words in the clue