One raised around a second bird (7)
I believe the answer is:
tinamou
'bird' is the definition.
(tinamou is a kind of bird)
'one raised around a second' is the wordplay.
'one' becomes 'unit' (synonyms).
'raised' is a reversal indicator (going up in a down clue).
'around' is an insertion indicator.
'second' becomes 'mo' (both are short periods of time).
'unit' back-to-front is 'tinu'.
'a'+'mo'='amo'
'tinu' going around 'amo' is 'TINAMOU'.
(Other definitions for tinamou that I've seen before include "US bird" , "Grouse, it may appear?" , "Bird related to rhea" , "South American bird" , "S. American partridge-like bird" .)