Crossword Genius

Excessively particular lover of old ham sandwiches (9)

Ross

I believe the answer is:

overexact

'excessively particular' is the definition.

'lover of old ham sandwiches' is the wordplay.
'lover of old' becomes 'ex' (an ex-lover).
'ham' becomes 'overact' (synonyms).
'sandwiches' means one lot of letters goes inside another (to sandwich is to block something in).
'ex' put inside 'overact' is 'OVEREXACT'.

I've seen this clue in The Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.