Sweep called back to apologise (5)
I believe the answer is:
range
'sweep' is the definition.
(both can mean extent or variety)
'called back to apologise' is the wordplay.
'called' becomes 'rang' (called on the phone).
'back to' indicates one should take the final letters.
The final letter of 'apologise' is 'e'.
'rang'+'e'='RANGE'
(Other definitions for range that I've seen before include "Set in a row" , "Scope, extent" , "Stove; variety" , "Prairie" , "bounds" .)