Bit of lamb I threw in range (5)
I believe the answer is:
ambit
'range' is the definition.
(I know that range can be written as ambit)
'bit of lamb i threw' is the wordplay.
'bit of' indicates a hidden word.
'AMBIT' can be found hidden inside 'lamb i threw'.
'in' acts as a link.
(Other definitions for ambit that I've seen before include "Range - surroundings" , "Circuit, compass" , "Scope or confines" , "Circumference" , "round" .)