See some boys being bashful (3)
I believe the answer is:
coy
'bashful' is the definition.
(I've seen this before)
'see some boys' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'some boys' becomes 'oy' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'c'+'oy'='COY'
'being' acts as a link.
Can you help me to learn more?
(Other definitions for coy that I've seen before include "Reserved" , "Military team in brief" , "Affectedly modest or shy" , "Pretending modesty" , "reluctant to divulge information" .)