Snack meal for one who needs a share? (10,5)

I believe the answer is:
ploughmans lunch
This clue might be a double definition.
'snack' is the first definition.
(I've seen this before)
'meal for one who needs a share?' is the second definition.
'ploughmans lunch' can be an answer for 'meal' (I've seen this before). I am unsure of the rest of the definition.
Can you help me to learn more?
(Other definitions for ploughmans lunch that I've seen before include "bite to eat" , "Snack" , "meal" .)