Comfortable having arms lifted (4)
I believe the answer is:
snug
'comfortable' is the definition.
(similar in meaning)
'arms lifted' is the wordplay.
'arms' becomes 'guns ' (gun is a kind of arm).
'lifted' says the letters should be written in reverse (going up in down clue).
'guns' reversed gives 'SNUG'.
'having' is the link.
(Other definitions for snug that I've seen before include "Cosy and comfortable" , "He joined" , "Cosy retreat" , "Bar-parlour" , "Compact" .)