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 the answer is hidden within the clue.
'PLAN' can be found hidden inside 'esplanade'.
(Other definitions for plan that I've seen before include "Off the right direction" , "Stratagem" , "Agenda" , "Formulate" , "propose" .)