Drug wayward son tried out, any number taken (7)
I believe the answer is:
steroid
'drug' is the definition.
(type of drug)
'wayward son tried out any number taken' is the wordplay.
'wayward' indicates anagramming the letters (wayward means out of control or chaotic).
'son' becomes 's' (genealogical abbreviation for son).
'out any number' becomes 'o' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'taken' is an insertion indicator.
's'+'tried'='stried'
'stried' with letters rearranged gives 'sterid'.
'sterid' enclosing 'o' is 'STEROID'.
Can you help me to learn more?
(Other definitions for steroid that I've seen before include "muscle-building compound" , "Controversial body-builder" , "Compound used as drug or performance enhancer" , "Editors (anag.)" , "Compond such as many hormones and vitamins" .)