Never mind - the pests are inside (6)
I believe the answer is:
vermin
'never mind the pests are inside' is the definition.
I can't tell whether this definition defines the answer.
'never mind the pests are inside' is the wordplay.
'are inside' indicates the answer is hidden within the clue.
'VERMIN' is hidden in the letters of 'never mind pests'.
Can you help me to learn more?
(Other definitions for vermin that I've seen before include "despicable people!" , "Common animals and birds, like rats and crows" , "eg Rats" , "Pestilent creatures" , "Harmful or disease-ridden animals" .)