Craft perfectly capturing upper-class country (7)
I believe the answer is:
tugboat
'craft' is the definition.
(tugboat is a kind of craft)
'perfectly capturing upper-class country' is the wordplay.
'perfectly' becomes 'to a t' ('to a T' or 'to a tee' can mean perfectly).
'capturing' is an insertion indicator.
'upper-class' becomes 'u' (similar in meaning).
'country' becomes 'GB' (Great Britain).
'u'+'gb'='ugb'
'toat' placed around 'ugb' is 'TUGBOAT'.
(Other definitions for tugboat that I've seen before include "Vessel towing larger vessels" , "water tower" , "Ship pulling a larger one" , "Vessel drawing" , "Harbour craft" .)