Poet embracing one TV pioneer (5)
I believe the answer is:
baird
'tv pioneer' is the definition.
(I've seen this in another clue)
'poet embracing one' is the wordplay.
'poet' becomes 'bard' (bard is a kind of poet).
'embracing' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'bard' going around 'i' is 'BAIRD'.
(Other definitions for baird that I've seen before include "John Logie - -" , "He devised television" , "inventive man" , "Television pioneer" , "Scottish inventor" .)