Waiting on sauce for empty waffle (3,7)
I believe the answer is:
lip service
'empty waffle' is the definition.
(lip service means empty talk)
'waiting on sauce' is the wordplay.
'waiting' becomes 'service' (I've seen this before).
'on' means one lot of letters go next to another.
'sauce' becomes 'lip' (I've seen this in other clues).
'service' after 'lip' is 'LIP-SERVICE'.
'for' acts as a link.
(Other definitions for lip service that I've seen before include "Insincere praise" , "getting no proper acknowledgment" , "It may be paid" , "Unreliable support" , "Insincere support" .)