Frank has the power - and acted on it (6)
I believe the answer is:
candid
'frank' is the definition.
(synonyms)
'the power and acted on it' is the wordplay.
'the power' becomes 'ca' (I am not sure about this - if you are sure you should believe this answer much more).
'and' becomes 'n' (common abbreviation for 'and').
'acted' becomes 'did' (I've seen this in other clues).
'on it' means one lot of letters go next to another.
'ca'+'n'+'did'='CANDID'
'has' acts as a link.
Can you help me to learn more?
(Other definitions for candid that I've seen before include "Plain" , "Frank, forthright" , "Frank - and CID (anag)" , "Truthful, frank" , "Forthrightly sincere" .)