May display power (5)
I believe the answer is:
might
This clue could be a double definition.
'may display' is the first definition.
'might' can be an answer for 'may' ('may' and 'might' are similar in meaning). I'm not certain of the 'display' bit.
'power' is the second definition.
(synonyms)
Can you help me to learn more?
(Other definitions for might that I've seen before include "May, in the past" , "intensity of feeling" , "Force; could" , "Great power/strength" , "Physical strength of old" .)