Boy starts learning with a big spoon (5)
I believe the answer is:
ladle
'a big spoon' is the definition.
(a ladle is a large spoon for serving)
'boy starts learning' is the wordplay.
'boy' becomes 'lad' (informal term for boy).
'starts learning' becomes 'le' (I can't explain this - if you can you should give a lot more credence to this answer).
'lad'+'le'='LADLE'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for ladle that I've seen before include "Serving implement" , "Large long-handled spoon" , "Spoon - a dell (anag)" , "Soup or sauce server" , "Large deep spoon for serving soup" .)