Grasp, too, that you approve of (4,4)

I believe the answer is:

hold with

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

'approve of' is the definition.

'grasp too' is the wordplay.
'grasp' becomes 'hold' (synonyms).
'too' becomes 'with' (I can't justify this - if you can you should give a lot more credence to this answer).
'hold'+'with'='HOLD WITH'

'that you' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

Want a hint initially instead of a full solution? Install my app