Crossword Genius

Democrats broaching alternative to Thatcher? There’s just a small catch (7)

Ross

I believe the answer is:

tiddler

'just a small catch' is the definition.
(term for a small fish)

I can't explain the remainder of the clue.

(Other definitions for tiddler that I've seen before include "Small fish (or child?)" , "Little chap" , "Tiny fish, child" , "A small fish children try to catch" , "Minnow" .)

I've seen this clue in The Times.
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