Strike back - speed has broken a tile (9)
I believe the answer is:
retaliate
'strike back' is the definition.
(synonyms)
'speed has broken a tile' is the wordplay.
'speed' becomes 'rate' (both can mean pace).
'has' means one lot of letters goes inside another.
'broken' is an anagram indicator.
'a'+'tile'='atile'
'atile' anagrammed gives 'etali'.
'rate' going around 'etali' is 'RETALIATE'.
(Other definitions for retaliate that I've seen before include "Attack in return for attack" , "Exact retribution" , "Give back blow for blow" , "Strike back, avenge" , "settle accounts" .)