Crossword Genius

Rider grasps this burden with Bob (9)

Ross

I believe the answer is:

saddlebow

'rider grasps this' is the definition.
(a horse rider grasps a saddlebow)

'burden with bob' is the wordplay.
'burden' becomes 'saddle' (synonyms).
'with' means one lot of letters go next to another.
'bob' becomes 'bow' (synonyms).
'saddle'+'bow'='SADDLEBOW'

(Another definition for saddlebow that I've seen is " Pommel".)

I've seen this clue in The Times.
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