Crossword Genius

Probably best guy to cover electromagnetism, you’re welcome! (2,2,5)


I believe the answer is:

be my guest

I'm a little stuck... Click here to teach me more about this clue!

'cover electromagnetism you're welcome' is the definition.
I can't judge whether this definition defines the answer.

'probably best guy' is the wordplay.
I cannot really understand how this works, but
an anagram of 'guy' is 'ygu' which is within the answer.
This explanation may well be incorrect...

'to' is the link.

Can you help me to learn more?

(Other definitions for be my guest that I've seen before include "as 1 [HOTELIERS] might say" , "Do as you wish!" , "Please do!" , "Go ahead" , "Help yourself!" .)

I've seen this clue in The Hindu.
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