Pick up good meat suitable for Jack Sprat (5)
I believe the answer is:
glean
'pick up' is the definition.
(I've seen this in another clue)
'good meat suitable for jack sprat' is the wordplay.
'good meat' becomes 'g' (I am not sure about this - if you are sure you should believe this answer much more).
'suitable for jack sprat' becomes 'lean' (I've seen this in another clue).
'g'+'lean'='GLEAN'
Can you help me to learn more?
(Other definitions for glean that I've seen before include "Gather (grain) after a harvest" , "Garner" , "Angle for harvest" , "Gather (grains of information?)" , "Reap as harvest" .)