Fairly straightforward, I found. Solving time: 16 mins.
As in recent weeks, will comment on a small number of what seemed the trickier or more interesting clues, but happy to explain any others if asked.
* = anagram
ACROSS
11 (c)AROUSER Misleading context suggesting possible anagram of ‘spree’
13 CONS TRAIN i.e. studies train
18 SPAGHETTI (GP: Eat this)* Amusing with an overall &lit. touch
27 S POTTER Potters with s moved to the front
DOWN
3 Harold LLOYD (Star of silent films in the 1920s) (Dolly)*
17 W (with) AI (A1) TRESS