English bird supported by partner for ever (9)
I believe the answer is:
eternally
'for ever' is the definition.
(I've seen this before)
'english bird supported by partner' is the wordplay.
'english' becomes 'e' (abbreviation).
'bird' becomes 'tern' (tern is a kind of bird).
'supported by partner' becomes 'ally' (I am not sure about this - if you are sure you should believe this answer much more).
'e'+'tern'+'ally'='ETERNALLY'
Can you help me to learn more?
(Other definitions for eternally that I've seen before include "constantly" , "for good" , "For evermore" , "Always and ever" , "Always and forever" .)