Yankee sits by front of treadmill, shattered after one minute (4-5)
I believe the answer is:
itsy-bitsy
'minute' is the definition.
(thesaurus)
'yankee sits by front of treadmill shattered after one' is the wordplay.
'yankee' becomes 'Y' (phonetic alphabet: alpha, bravo, charlie etc.).
'front of' indicates taking the first letters (the letter at the front of the word).
'shattered' is an anagram indicator.
'after' means one lot of letters go next to another.
'one' becomes 'i' (Roman numeral).
The initial letter of 'treadmill' is 't'.
'y'+'sits'+'by'+'t'='ysitsbyt'
'ysitsbyt' with letters rearranged gives 'tsybitsy'.
'tsybitsy' after 'i' is 'ITSY-BITSY'.
(Other definitions for itsy-bitsy that I've seen before include "Very little" , "Teeny-weeny" , "Teensy-weensy" , "Very small, tiny" .)