Crossword Genius

Rather avant-garde poet's always collaring head of BBC 1 (6)

Ross

I believe the answer is:

edgier

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'rather avant-garde' is the definition.
I can't tell whether this definition defines the answer.

'poet's always collaring head of bbc 1' is the wordplay.
'poet's always' becomes 'e'er' ('e'er' is a poetic term for 'ever' or 'always').
'collaring' means one lot of letters goes inside another.
'head of bbc' becomes 'DG' (abbreviation for Director-General).
'1' becomes 'I' (Roman numeral).
'dg'+'i'='dgi'
'eer' placed around 'dgi' is 'EDGIER'.

Can you help me to learn more?

(Other definitions for edgier that I've seen before include "More jittery" , "More nervous" , "More brittle" .)

I've seen this clue in The Independent.
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