In a position to (4)
I believe the answer is:
able
'in a position to' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for able that I've seen before include "Having the power, skill or means (to do something)" , "Clever skilful" , "Bale out, being competent" , "See 21" , "Skilled" .)