Henry in agreeable position (5)
I believe the answer is:
niche
'position' is the definition.
(niche is a kind of position)
'henry in agreeable' is the wordplay.
'henry' becomes 'h' (symbol for the unit of electrical inductance).
'in' means one lot of letters goes inside another.
'agreeable' becomes 'nice' (I've seen this before).
'h' put within 'nice' is 'NICHE'.
(Other definitions for niche that I've seen before include "Cosy spot" , "small specialised market" , "Place that's cosy" , "Suitable position (in market, life etc)" , "somewhere comfortable" .)