Get a mug at the first feasible opportunity (4)
I believe the answer is:
asap
'the first feasible opportunity' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'get a mug' is the wordplay.
'get' says to put letters next to each other.
'mug' becomes 'sap'.
'a' next to 'sap' is 'ASAP'.
'at' acts as a link.
Can you help me to learn more?
(Other definitions for asap that I've seen before include "'As quickly as you can, initially (4)'" , "Notation meaning with minimum delay" , "Notation for urgent, quick as you can (4)" , "Common acronym for quick-as-you-can" , "Notation for as quickly as you can" .)