Stick parts of biro delicately together (3)
I believe the answer is:
rod
'stick' is the definition.
(I know that rod is a type of stick)
'parts of biro delicately together' is the wordplay.
'parts of' says the answer is hidden in the clue (I've seen 'part of' mean this).
'ROD' is hidden in the letters of 'biro delicately together'.
(Other definitions for rod that I've seen before include "A stiff stick" , "Thin straight bar" , "Little boy" , "See 13" , "Stick; angler" .)