Force into an inadequate space (8)
I believe the answer is:
shoehorn
'force into an inadequate space' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for shoehorn that I've seen before include "Aid to squeezing foot into footwear" , "It facilitates getting foot into footwear" , "Force into an inadequate space" , "What wife too big for her boots may need" , "A fitting device" .)