Looking to call behind shelter (7)
I believe the answer is:
leering
'looking' is the definition.
(leering is a kind of looking)
'call behind shelter' is the wordplay.
'call' becomes 'ring' (telephone call).
'behind' says to put letters next to each other.
'shelter' becomes 'lee' (as in lee side, the side sheltered from wind).
'ring' put after 'lee' is 'LEERING'.
'to' acts as a link.
(Other definitions for leering that I've seen before include "Looking suggestively" , "appearing lascivious" , "giving the glad eye" , "Ogling" , "Gazing lasciviously" .)