Map of esplanade (4)
I believe the answer is:
plan
'map' is the definition.
(eg the plans for a building)
'of esplanade' is the wordplay.
'of' indicates a hidden word.
'PLAN' is hidden within 'esplanade'.
(Other definitions for plan that I've seen before include "Off the right direction" , "Stratagem" , "Agenda" , "Formulate" , "propose" .)