Crossword Genius

Hold on, calm down! (3,1,4)

Ross

I believe the answer is:

get a grip

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

'calm down' is the definition.
(I've seen this in another clue)

'hold' is the wordplay.
I cannot really understand how this works, but
'hold' could be 'grip' (synonyms) and 'grip' is found within the answer.
The remaining letters 'geta' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'on' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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