Supplier caught by spymaster (8)
I believe the answer is:
chandler
'supplier' is the definition.
(thesaurus)
'caught by spymaster' is the wordplay.
I cannot really understand how this works, but
'caught' could be 'c' (cricket abbreviation) and 'c' is found in the answer.
The remaining letters 'handler' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for chandler that I've seen before include "Dealer, especially in ship's supplies" , "Author of Philip Marlowe thrillers, d.1959" , "Maker of candles" , "Retailer" , "Merchant" .)