Uncovered gravlax stirred to provide grub (5)
I believe the answer is:
larva
'grub' is the definition.
(I've seen this before)
'uncovered gravlax stirred' is the wordplay.
'uncovered' means to look at the middle letters.
'stirred' indicates an anagram.
The centre of 'gravlax' is 'ravla'.
'ravla' is an anagram of 'LARVA'.
'to provide' acts as a link.
(Other definitions for larva that I've seen before include "Grub of e.g. beetle" , "Insect in the first post-egg stage of its life" , "Woodworm" , "a developmental stage" , "Tadpole or caterpillar, say" .)