Crossword Genius

Crush end of thumb in doorpost (4)

Ross

I believe the answer is:

jamb

'doorpost' is the definition.
(post holding up a door)

'crush end of thumb' is the wordplay.
'crush' becomes 'jam' (synonyms).
'end of' indicates one should take the final letters.
The final letter of 'thumb' is 'b'.
'jam'+'b'='JAMB'

'in' acts as a link.

(Other definitions for jamb that I've seen before include "part of doorway?" , "Doorpost" , "Part of door frame" , "bit on the side?" , "Vertical part to a doorframe" .)

I've seen this clue in The Guardian.
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