Some dancing bobbins (5)
I believe the answer is:
reels
'some dancing bobbins' is the definition.
'reels' can be an answer for 'bobbins' ('reel' can be a synonym of 'bobbin'). I'm not certain of the 'some dancing' bit.
'dancing bobbins' is the wordplay.
'dancing' becomes 'reel' (reel is a kind of dancing).
'bobbins' becomes 's' (I can't justify this - if you can you should give a lot more credence to this answer).
'reel'+'s'='REELS'
Can you help me to learn more?
(Other definitions for reels that I've seen before include "Scottish dances" , "Highland dances" , "Staggers about in Irish dances" , "Old film parts" , "Folk dances" .)