Try strap for lifting bird (7)
I believe the answer is:
gosling
'bird' is the definition.
(gosling is a kind of bird)
'try strap for lifting' is the wordplay.
'try' becomes 'go' (both can mean an attempt).
'strap for lifting' becomes 'sling' (a sling lifts a broken arm).
'go'+'sling'='GOSLING'
(Other definitions for gosling that I've seen before include "Little bird" , "Young goose" , "Young bird" , "Young waterbird" .)