Might and power and another phrase (7)
I believe the answer is:
perhaps
'might and' is the definition.
I can't tell whether this definition defines the answer.
'power and another phrase' is the wordplay.
'power' becomes 'p' (symbol in physics).
'and' means one lot of letters go next to another.
'another' is an anagram indicator.
'phrase' anagrammed gives 'erhaps'.
'p'+'erhaps'='PERHAPS'
Can you help me to learn more?
(Other definitions for perhaps that I've seen before include "Quite possibly" , "say" , "Possibly but not certainly" , "Conceivably" , "Possibly, maybe" .)