Crossword Genius

Bump one's head and lose one's rag (3,3,7)

Ross

I believe the answer is:

hit the ceiling

I'm a little stuck... Click here to teach me more about this clue!

'lose one's rag' is the definition.
I can't tell whether this defines the answer.

'bump one's head' is the wordplay.
'bump' becomes 'hit' (synonyms).
'one' becomes 'the' (both can introduce a definite example of something).
'head' becomes 'ceiling' (I am not sure about this - if you are sure you should believe this answer much more).
'hit'+'the'+'ceiling'='HIT THE CEILING'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for hit the ceiling that I've seen before include "Overzealous pogo dancer might" , "combust" .)

I've seen this clue in The Telegraph.
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