Tramp hiding in Greenwich Ikea (4)
I believe the answer is:
hike
'tramp' is the definition.
(I know that tramp is a kind of hike)
'hiding in greenwich ikea' is the wordplay.
'hiding' indicates the answer is hidden within the clue.
'HIKE' is hidden within 'in greenwich ikea'.
(Other definitions for hike that I've seen before include "Long, hard walk" , "Long march; increase" , "Jack" , "Long walk; big price rise" , "Long ramble" .)