PM once having a supernatural power? (4)

I believe the answer is:

maya

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'supernatural power?' is the definition.
The definition suggests a singular noun which matches the answer.

'pm once having a' is the wordplay.
'pm once' becomes 'May' (Theresa May).
'having' is a charade indicator (letters next to each other).
'may'+'a'='MAYA'

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(Other definitions for maya that I've seen before include "People of the New World" , "Native people of Central America" , "Central American language" , "Indian" , "People who built Chichen Itza, Tikal etc." .)

I've seen this clue in The Guardian.

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