Fertile spot, like one in Eurostar centre (5)
I believe the answer is:
oasis
'fertile spot' is the definition.
(I've seen this before)
'like one in eurostar centre' is the wordplay.
'like' becomes 'as'.
'one' becomes 'i' (Roman numeral).
'in' indicates putting letters inside.
'centre' means to look at the middle letters.
The centre of 'eurostar' is 'os'.
'as'+'i'='asi'
'asi' placed into 'os' is 'OASIS'.
(Other definitions for oasis that I've seen before include "English rock group in the desert" , "Peaceful spot" , "place of relief" , "Band with Liam and Noel Gallagher" , "Place of rest in the midst of gloom" .)