Too ambitious removing clothing, lovers agree, shivering (9)
I believe the answer is:
overeager
'too ambitious' is the definition.
(too eager or ambitious)
'removing clothing lovers agree shivering' is the wordplay.
'removing clothing' says to take the centre (the letters which clothe the word are removed).
'shivering' indicates an anagram.
The middle of 'lovers' is 'over'.
'agree' is an anagram of 'eager'.
'over'+'eager'='OVEREAGER'
(Other definitions for overeager that I've seen before include "with enthusiasm" , "Excessively keen" , "too anxious to please?" .)