Flatten a gourd (6)

I believe the answer is:

squash

I believe this clue is a double definition.

'flatten' is the first definition.
(I've seen this before)

'a gourd' is the second definition.
(I've seen this before)

(Other definitions for squash that I've seen before include "Fruit - drink - crush" , "Indoor racquet game" , "Ballgame for two" , "Trample on" , "Crush; gourd" .)

I've seen this clue in The Daily Express.

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