He might not let you into empty bar carrying cat (7)
I believe the answer is:
bouncer
'he might not let you' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'empty bar carrying cat' is the wordplay.
'empty' suggests removing the centre.
'carrying' is an insertion indicator.
'cat' becomes 'ounce' (ounce can mean a snow leopard).
'bar' with its centre removed is 'br'.
'br' enclosing 'ounce' is 'BOUNCER'.
'into' is the link.
Can you help me to learn more?
(Other definitions for bouncer that I've seen before include "Dance-hall employee" , "Club employee" , "cheque that's worthless?" , "A heavy - ball, say" , "Nightclub security doorman" .)