Muscular expander almost given to delay (7)
I believe the answer is:
dilator
'muscular expander' is the definition.
The definition suggests a singular noun which matches the answer.
'almost given to delay' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'given to delay' becomes 'dilatory'.
'dilatory' with its final letter taken off is 'DILATOR'.
Can you help me to learn more?
(Other definitions for dilator that I've seen before include "Muscle such as that controlling eye's pupil" , "Expanding, I do" , "Blood pressure drug" .)