See a net spread out inside the shed (4-2)
I believe the answer is:
lean-to
'the shed' is the definition.
(I've seen this before)
'see a net spread out inside' is the wordplay.
'see' becomes 'lo' (archaic exclamation meaning 'look!').
'spread out' indicates anagramming the letters (I've seen 'spreading out' mean this).
'inside' means one lot of letters goes inside another.
'a'+'net'='anet'
'anet' anagrammed gives 'eant'.
'lo' going around 'eant' is 'LEAN-TO'.
(Other definitions for lean-to that I've seen before include "On late (anag)" , "Outbuilding propped against another wall" , "Add-on building" , "Shed, outbuilding" , "Structure whose roof has only one slope" .)