Slowly move young woman back, straggler (7)
I believe the answer is:
laggard
'straggler' is the definition.
(I've seen this in another clue)
'slowly move young woman back' is the wordplay.
'slowly move' becomes 'drag' (to drag is to move slowly or with difficulty).
'young woman' becomes 'gal' (synonyms).
'back' says the letters should be written in reverse.
'drag'+'gal'='draggal'
'draggal' written backwards gives 'LAGGARD'.
(Other definitions for laggard that I've seen before include "who's getting behind?" , "Slow mover" , "slowcoach" , "See straggler" , "Lingerer, time-waster" .)