Grub available during regular vacation (5)
I believe the answer is:
larva
'grub' is the definition.
(I know that grub can be written as larva)
'during regular vacation' is the wordplay.
'during' indicates the answer is hidden within the clue.
'LARVA' is hidden in the letters of 'regular vacation'.
'available' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for larva that I've seen before include "Grub; insect" , "Worm-like insect before metamorphosis" , "Grub of e.g. beetle" , "Animal in immature state" , "Immature life form" .)