Become more involved in kitchen refurbishment (7)
I believe the answer is:
thicken
'become more involved' is the definition.
(e.g. a plot)
'kitchen refurbishment' is the wordplay.
'refurbishment' indicates anagramming the letters (I've seen this in other clues).
'kitchen' with letters rearranged gives 'THICKEN'.
'in' acts as a link.
(Other definitions for thicken that I've seen before include "(Of a plot) become more complicated" , "Clot" , "Make dense" , "Make more viscous" , "Become more involved" .)