Column in jetty outside terminal (8)
I believe the answer is:
pilaster
'column' is the definition.
(pilaster is a kind of column)
'jetty outside terminal' is the wordplay.
'jetty' becomes 'pier' (I've seen this before).
'outside' is an insertion indicator.
'terminal' becomes 'last' (synonyms).
'pier' going around 'last' is 'PILASTER'.
'in' acts as a link.
(Other definitions for pilaster that I've seen before include "Rectangular column support projecting slightly from a wall" , "Piles tar into a form of column" , "Square column" , "Rectangular column projected from wall" , "Decorative column standing out from the fa?ade of a building" .)