Take another look: it’s not exactly Air on a G String ? (9)

'string ?' is the definition.
The definition and answer can be both to do with motion as well as being verbs in their base form.
Perhaps you can see an association between them that I can't see?

'take another look it's not exactly air on a g' is the wordplay.
I cannot quite see how this works, but
'take' could be 'r' (abbreviation for 'recipe', Latin for 'take') and 'r' is located in the answer.
'a' is present in the answer.
'g' could be 'k' (synonyms) and 'k' is present in the answer.
'not exactly' could be 'c' (short for 'circa') and 'c' is present in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is present in the answer.
The remaining letters 'back' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?