Take the lead for granted? (6,7)

I believe the answer is:

assume command

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

'granted?' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'take the lead for' is the wordplay.
'take' becomes 'assume' (synonyms).
'the lead for' becomes 'command' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'assume'+'command'='ASSUME COMMAND'

Can you help me to learn more?

I've seen this clue in The Globe and Mail and The Irish Independent.

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