Try the strength of a piece of white string (4)
I believe the answer is:
test
'try the strength' is the definition.
'test' can be an answer for 'try' (synonyms). I am unsure of the 'the strength' bit.
'a piece of white string' is the wordplay.
'a piece of' indicates a hidden word.
'TEST' can be found hidden inside 'white string'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for test that I've seen before include "water flowing through Hampshire" , "big game" , "Dip one's toe in" , "Exam to play international cricket" , "Try, examine critically" .)