Sailors discovered new town (5)
I believe the answer is:
crewe
'town' is the definition.
(I've seen this before)
'sailors discovered new' is the wordplay.
'sailors' becomes 'crew' (as in a ship's crew).
'discovered' indicates the central letters (dis-covered - outer letters removed).
The middle of 'new' is 'e'.
'crew'+'e'='CREWE'
(Other definitions for crewe that I've seen before include "railway junction" , "Famous railway town" , "Ace wanderer lax (anag)" , "Cheshire town of railway fame" , "Cheshire rail junction" .)