Crossword Genius

Gift -- no charge -- be my guest (4,4)

Ross

I believe the answer is:

feel free

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

'be my guest' is the definition.
(I've seen this in another clue)

'gift no charge' is the wordplay.
'gift' becomes 'feel' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'no charge' becomes 'free' (synonyms).
'feel'+'free'='FEEL FREE'

Can you help me to learn more?

(Another definition for feel free that I've seen is " Be permitted".)

I've seen this clue in The Telegraph.
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