Batting and ready to grab century -- such is cricket (6)
I believe the answer is:
insect
'is cricket' is the definition.
(thesaurus)
'batting and ready to grab century' is the wordplay.
'batting' becomes 'in'.
'and' means one lot of letters go next to another.
'ready to' becomes 'set' ('set' can be a synonym of 'ready to').
'grab' is an insertion indicator.
'century' becomes 'c' (common abbreviation).
'set' placed around 'c' is 'sect'.
'in'+'sect'='INSECT'
'such' acts as a link.
(Other definitions for insect that I've seen before include "may be attracted to a website?" , "Contemptible person" , "Bug" , "Worthless person" , "fly, perhaps" .)