Screw suitable without measure (9)
I believe the answer is:
propeller
'screw' is the definition.
(I've seen this before)
'suitable without measure' is the wordplay.
'suitable' becomes 'proper' (synonyms).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'measure' becomes 'ell' (historical unit of length).
'proper' going around 'ell' is 'PROPELLER'.
(Other definitions for propeller that I've seen before include "Screw (on a boat)" , "It rotates to push against air or water" , "Driver" , "attachment on aircraft" , "Airscrew" .)