Foot of water in view (7)
I believe the answer is:
spondee
'foot' is the definition.
(type of metrical foot in poetry)
'water in view' is the wordplay.
'water' becomes 'pond' (pond is a kind of water**).
'in' indicates putting letters inside.
'view' becomes 'see' ('see' can be a synonym of 'view').
'pond' going into 'see' is 'SPONDEE'.
'of' is the link.
(Other definitions for spondee that I've seen before include "Metric foot of two long syllables" , "No speed required for poetic metrical foot" , "bit of verse" .)