Cleaners seen around the French King? Not at present (7)
I believe the answer is:
charles
'king? not at present' is the definition.
(Prince Charles is Queen Elizabeth's heir)
'cleaners seen around the french' is the wordplay.
'cleaners' becomes 'chars' (char is a kind of cleaner).
'seen around' is an insertion indicator.
'the french' becomes 'le'.
'chars' enclosing 'le' is 'CHARLES'.
(Other definitions for charles that I've seen before include "27 [PRINCE]" , "-- Darwin; -- Kingsley" , "Prague bridge; two Eng. kings" , "Beheaded English king" , "Caroline king" .)