Submarine possibly in Kentish Town (8)
I believe the answer is:
sandwich
This clue could be a double definition.
'submarine possibly' is the first definition.
(I know that Cuban sandwich is a type of sandwich)
'kentish town' is the second definition.
'sandwich' can be an answer for 'town' (I have seen 'seaside town' mean 'sandwich' so perhaps 'town' could also mean 'sandwich'). I'm unsure of the 'kentish' bit.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for sandwich that I've seen before include "Picnic food" , "A lord's snack" , "Two slices with something in between" , "Double-decker, perhaps" , "Snack - place in Kent" .)