No good in breaking each nail - try another way (6,4)
I believe the answer is:
change tack
'try another way' is the definition.
'no good in breaking each nail' is the wordplay.
'no' becomes 'n' (common abbreviation**).
'good' becomes 'g' (abbreviation).
'in' means one lot of letters goes inside another.
'breaking' indicates an anagram.
'nail' becomes 'tack' (tack is a kind of nail).
'n'+'g'='ng'
'each' anagrammed gives 'chae'.
'ng' inserted within 'chae' is 'change'.
'change'+'tack'='CHANGE TACK'
(Other definitions for change tack that I've seen before include "choose a different course" , "Take a new direction" , "select a different course?" , "Embark on new diet" .)