Shy but going to seek the rest (8)

I believe the answer is:

retiring

I'm a little stuck... Click here to teach me more about this clue!

'shy' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for retiring that I've seen before include "Shy and fond of being on one's own" , "Giving up work permanently" , "Like an unassertive person" , "Giving up work for good" , "heading for bed" .)

I've seen this clue in The Globe and Mail.

Want a hint initially instead of a full solution? Install my app