Still at home, regret regularly missing out (5)
I believe the answer is:
inert
'still' is the definition.
(I've seen this before)
'home regret regularly missing out' is the wordplay.
I cannot quite see how this works, but
'home' could be 'in' ('he's home' can mean 'he's in') and 'in' is present in the answer.
This explanation may well be incorrect...
'at' acts as a link.
Can you help me to learn more?
(Other definitions for inert that I've seen before include "Lifeless; apathetic" , "Lifeless, sluggish" , "Chemically unreactive" , "Dormant, lifeless" , "Motionless or inanimate" .)