Ogle, needing to grab companion? Well he might! (6)
I believe the answer is:
lecher
'well he might' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'ogle needing to grab companion?' is the wordplay.
'ogle' becomes 'leer' (I've seen this before).
'needing to grab' indicates putting letters inside.
'companion?' becomes 'ch' (Companion of Honour).
'leer' enclosing 'ch' is 'LECHER'.
(Other definitions for lecher that I've seen before include "Libertine" , "Person of unrestrained sexual desires" , "He's obsessed with sex" , "Promiscuous chap" .)