Rig agendas cunningly and increase power (10)

I believe the answer is:

aggrandise

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

'increase power' is the definition.
'aggrandise' can be an answer for 'increase' ('increase'->'aggrandize' is in my internal thesaurus and 'ize'->'ise'). I'm not sure about the 'power' bit.

'rig agendas cunningly' is the wordplay.
'cunningly' is an anagram indicator.
'rig'+'agendas'='rigagendas'
'rigagendas' is an anagram of 'AGGRANDISE'.

'and' is the link.

Can you help me to learn more?

(Other definitions for aggrandise that I've seen before include "Magnify; increase power of" , "Advance" , "Give promotion to" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.