Pole sensing couple is approaching (5)
I believe the answer is:
nears
'is approaching' is the definition.
(I've seen this before)
'pole sensing couple' is the wordplay.
'pole' becomes 'n' (abbreviation for North, as in North Pole).
'sensing couple' becomes 'ears' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'n'+'ears'='NEARS'
Can you help me to learn more?
(Other definitions for nears that I've seen before include "Bears down" , "Becomes closer" , "Moves closer to" , "Uses snare to get closer" , "Saner (anag.)" .)