Bets unclad singer is one making an impression (6)
I believe the answer is:
etcher
'is one making an impression' is the definition.
(person who creates an impression in something)
'bets unclad singer' is the wordplay.
'unclad' means to look at the middle letters (the word is undressed of its external letters).
'singer' becomes 'cher' (I've seen this in other clues).
The middle of 'bets' is 'et'.
'et'+'cher'='ETCHER'
(Other definitions for etcher that I've seen before include "Artist such as Rembrandt" , "One making an impression" , "One with incisive career" , "Engraver" , "Maybe she makes engravings" .)