Oxygen provided during close call (5)
I believe the answer is:
shout
'call' is the definition.
(I know that call can be written as shout)
'oxygen provided during close' is the wordplay.
I cannot quite understand how this works, but
'oxygen' could be 'o' (atomic symbol for oxygen) and 'o' is present in the answer.
'close' could be 'shut' (synonyms) and 'shut' is found in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for shout that I've seen before include "Yell" , "Bawl" , "Loud call" , "Noise" , "bellow" .)