What you do to gravy in the kitchen, perhaps (7)
I believe the answer is:
thicken
'what you do to gravy in' is the definition.
The definition suggests a singular noun but the answer is not.
'kitchen perhaps' is the wordplay.
'perhaps' indicates an anagram.
'kitchen' with letters rearranged gives 'THICKEN'.
'the' acts as a link.
Can you help me to learn more?
(Other definitions for thicken that I've seen before include "(Of a plot) become more complicated" , "Become more viscous" , "Become more dense (as plots do)" , "Become more involved" , "get fatter?" .)