Animal reserve — a distant one seen in flash (6,4)
I believe the answer is:
safari park
'animal reserve' is the definition.
(area where animals are kept)
'a distant one seen in flash' is the wordplay.
'a distant' becomes 'afar' (I've seen this before).
'one' becomes 'i' (Roman numeral).
'seen in' is an insertion indicator.
'flash' becomes 'spark' (spark is a kind of flash).
'afar'+'i'='afari'
'afari' put into 'spark' is 'SAFARI PARK'.
(Other definitions for safari park that I've seen before include "Large area reserved for wildlife" , "Wild beast may be seen here" , "in which pride is visible?" , "observed lions here" , "where big game can be watched" .)