Crossword Genius

Heath, say: I permit miners to roam (5,8)


I believe the answer is:

prime minister

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'heath' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'i permit miners to roam' is the wordplay.
'to roam' indicates anagramming the letters (I've seen 'roaming' mean this).
'ipermitminers' with letters rearranged gives 'PRIME MINISTER'.

'say' acts as a link.

Can you help me to learn more?

(Other definitions for prime minister that I've seen before include "May" , "North, for instance" , "Law once in UK" , "PM" , "Head of government" .)

I've seen this clue in The Times.
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