Zulu I found in this region (4)
I believe the answer is:
zone
'this region' is the definition.
(zone is a kind of region)
'zulu i' is the wordplay.
'zulu' becomes 'Z' (phonetic alphabet: alpha, bravo, charlie etc.).
'i' becomes 'one' (Roman numeral for one).
'z'+'one'='ZONE'
'found in' is the link.
(Other definitions for zone that I've seen before include "Designated or defined area" , "Distinctive area" , "Area, division" , "Area with a particular characteristic" , "Region; time area" .)