Batting, prepared to bag 100 in cricket, say (6)
I believe the answer is:
insect
'cricket say' is the definition.
(cricket is an example)
'batting prepared to bag 100' is the wordplay.
'batting' becomes 'in' (as in batting or being 'in' in cricket).
'prepared' becomes 'set' (set up or ready).
'to bag' is an insertion indicator.
'100' becomes 'C' (Roman numeral).
'set' enclosing 'c' is 'sect'.
'in'+'sect'='INSECT'
'in' is the link.
(Other definitions for insect that I've seen before include "Small, usually winged, creature" , "Bug" , "Small animal with six legs" , "Little creature" , "Small arthropod creature" .)