Wonderful hawk circling wide (5)
I believe the answer is:
swell
'wonderful' is the definition.
(swell can mean excellent)
'hawk circling wide' is the wordplay.
'hawk' becomes 'sell' (I've seen this in another clue).
'circling' means one lot of letters goes inside another (circling can mean going around or containing).
'wide' becomes 'w' (abbreviation e.g. in cricket).
'sell' enclosing 'w' is 'SWELL'.
(Other definitions for swell that I've seen before include "Become larger in size" , "Grand" , "Burgeon" , "Become larger or rounder" , "slow rise and fall" .)