Crossword Genius

Bone in Dublin Bay occasionally (4)

Ross

I believe the answer is:

ulna

'bone' is the definition.
(ulna is a kind of bone)

'dublin bay occasionally' is the wordplay.
'occasionally' indicates alternate letters (letters taken at regular intervals or occasions).
'dublin'+'bay'='dublinbay'
The alternating letters of 'dublinbay' are 'ULNA'.

'in' is the link.

(Other definitions for ulna that I've seen before include "Long bone in the arm" , "part of anatomy" , "Thinner of two long bones in forearm" , "Part of bone-structure" , "Part of body" .)

I've seen this clue in The Times.
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