Labour lass raised snail (7)
I believe the answer is:
laggard
'snail' is the definition.
(thesaurus)
'labour lass raised' is the wordplay.
'labour' becomes 'drag' (I can't justify this - if you can you should give a lot more credence to this answer).
'lass' becomes 'gal' (I've seen this before).
'raised' says the letters should be written backwards.
'drag'+'gal'='draggal'
'draggal' in reverse letter order is 'LAGGARD'.
Can you help me to learn more?
(Other definitions for laggard that I've seen before include "One failing to keep up" , "Loiterer" , "who's getting behind?" , "slowcoach" , "Person falling behind" .)