Troops coming to Kentish Town in trying experience (6)
I believe the answer is:
ordeal
'trying experience' is the definition.
(an ordeal is a difficult or trying experience)
'troops coming to kentish town' is the wordplay.
'troops' becomes 'or' (military abbreviation for other ranks).
'coming to' says to put letters next to each other.
'kentish town' becomes 'deal' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'or'+'deal'='ORDEAL'
'in' is the link.
Can you help me to learn more?
(Other definitions for ordeal that I've seen before include "very hard test" , "Trial; nightmare" , "A difficult or harrowing time" , "A test of endurance or or difficult experience" , "Torment" .)