I love getting a thank-you letter (4)

I believe the answer is:

iota

'letter' is the definition.
(iota is a kind of letter)

'i love getting a thank-you' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'getting' means one lot of letters go next to another.
'a thank you' becomes 'ta'.
'i'+'o'+'ta'='IOTA'

(Other definitions for iota that I've seen before include "letter from abroad" , "Tiny piece" , "Just a jot, from Greek alphabet" , "Greek equivalent of the letter I" , "Contrivance" .)

I've seen this clue in The Telegraph.

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