Crossword Genius

Letter from internet company returned (3)

Ross

I believe the answer is:

psi

'letter' is the definition.
(I know that psi is a type of letter)

'internet company returned' is the wordplay.
'internet company' becomes 'ISP' (internet service provider).
'returned' shows that the letters should be reversed in order.
'isp' back-to-front is 'PSI'.

'from' acts as a link.

(Other definitions for psi that I've seen before include "Pounds per sq. in. (abbr.)" , "Greek letter; pounds per square inch (abbrev.)" , "letter from abroad" , "foreign letter" , "Pounds per square inch (abbr.); Greek letter" .)

I've seen this clue in The Guardian.
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