Don't give up in gym initially restricted by band aid (7)
I believe the answer is:
plaster
'band aid' is the definition.
(thesaurus)
'don't give up in gym initially restricted' is the wordplay.
'don't give up' becomes 'last' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'gym' becomes 'pe'.
'initially' indicates taking the first letters.
The first letter of 'restricted' is 'r'.
'last' placed inside 'pe' is 'plaste'.
'plaste'+'r'='PLASTER'
'by' acts as a link.
Can you help me to learn more?
(Other definitions for plaster that I've seen before include "Daub" , "Wall finish - protection for cut" , "Smooth covering for walls and ceilings" , "Stucco" , "Adhesive material" .)