Very impressive record -- I start to cheer (4)
I believe the answer is:
epic
'very impressive' is the definition.
(I've seen this in another clue)
'record i start to cheer' is the wordplay.
'record' becomes 'EP' (abbreviation for extended play record).
'start to' says to take the initial letters.
The first letter of 'cheer' is 'c'.
'ep'+'i'+'c'='EPIC'
(Other definitions for epic that I've seen before include "Marathon" , "Blown up" , "blockbuster" , "Long literary work about great events" , "Surpassing the ordinary" .)