Poet one introduced to Eliot, initially, around spring (7)
I believe the answer is:
sitwell
'poet' is the definition.
(I've seen this before)
'one introduced to eliot initially around spring' is the wordplay.
'one' becomes 'i' (Roman numeral).
'introduced to' means one lot of letters goes inside another.
'eliot initially' becomes 'TS' (initials of poet TS Eliot).
'around' shows that the letters should be reversed in order.
'spring' becomes 'well' (both can mean a source of water).
'i' placed within 'ts' is 'tis'.
'tis' in reverse letter order is 'sit'.
'sit'+'well'='SITWELL'
(Other definitions for sitwell that I've seen before include "English poet and critic, d. 1964" , "name of literary siblings" , "Family of writers" , "Dame Edith --, English poet" , "English literary family" .)