Exhausted and inclined to blaspheme when losing head (5)

I believe the answer is:
weary
'exhausted' is the definition.
(I've seen this in another clue)
'inclined to blaspheme when losing head' is the wordplay.
I cannot really see how this works, but
'head' could be 'ear' (I have seen 'Head of corn' mean 'ear' so perhaps 'head' could also mean 'ear') and 'ear' is found in the answer.
This explanation may well be incorrect...
'and' acts as a link.
Can you help me to learn more?
(Other definitions for weary that I've seen before include "Physically and mentally fatigued" , "Flagging" , "Tired - bored" , "Whacked" , "Enervated" .)
