Pull mother back in range (5)
I believe the answer is:
gamut
'range' is the definition.
(gamut can mean a range or variety)
'pull mother back in' is the wordplay.
'pull' becomes 'gut' (I am not sure about this - if you are sure you should believe this answer much more).
'mother' becomes 'ma' (ma can mean mother).
'back' shows that the letters should be reversed in order.
'in' means one lot of letters goes inside another.
'ma' reversed gives 'am'.
'gut' placed around 'am' is 'GAMUT'.
Can you help me to learn more?
(Other definitions for gamut that I've seen before include "Whole range (from A to Z)" , "Full extent" , "Ambit" , "The whole range of, say emotions" , "Entire scope" .)