Yelled out in the hangar (7)
I believe the answer is:
shouted
'yelled' is the definition.
('shout' can be a synonym of 'yell')
'out in the hangar' is the wordplay.
'in' means one lot of letters goes inside another.
'the hangar' becomes 'shed' (I've seen this in another clue).
'out' placed within 'shed' is 'SHOUTED'.
(Other definitions for shouted that I've seen before include "spoke loudly" , "Yelled" .)