Plant providing nectar across the street (7)
I believe the answer is:
honesty
'plant' is the definition.
(honesty is a kind of plant)
'nectar across the street' is the wordplay.
'nectar' becomes 'honey' (I've seen this before).
'across' means one lot of letters goes inside another.
'the street' becomes 'st'.
'honey' going around 'st' is 'HONESTY'.
'providing' acts as a link.
(Other definitions for honesty that I've seen before include "A virtue" , "It's said to be the best policy" , "truth" , "Probity; plant" , "Straightforwardness" .)