Carry, as echo in pub (4)
I believe the answer is:
bear
'carry' is the definition.
(bearing is a kind of carrying)
'echo in pub' is the wordplay.
'echo' becomes 'e' (phonetic alphabet: alpha, bravo, charlie etc.).
'in' means one lot of letters goes inside another.
'pub' becomes 'bar' (I've seen this before).
'e' inserted inside 'bar' is 'BEAR'.
'as' is the link.
(Other definitions for bear that I've seen before include "Support; produce (fruit)" , "Large carnivore" , "Paddington, for example?" , "Heavy carnivorous quadruped" , "Carry, convey" .)