Lacking position, though (15)
I believe the answer is:
notwithstanding
'though' is the definition.
(thesaurus)
'lacking position' is the wordplay.
I cannot quite understand how this works, but
'lacking' could be 'no' (I've seen this in other clues) and 'no' is located in the answer.
'position' could be 'standing' (standing is a kind of position) and 'standing' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for notwithstanding that I've seen before include "Although" , "... in spite" , "without being still" , "However" , "Even so" .)