Loyal to a tow-headed woman (4)
I believe the answer is:
true
'loyal' is the definition.
(I've seen this in another clue)
'tow-headed woman' is the wordplay.
'tow' becomes 'tr' (I can't justify this - if you can you should give a lot more credence to this answer).
'headed' means to remove the first letter (head can mean to remove the top from something).
'woman' becomes 'Sue'.
'sue' with its first letter taken away is 'ue'.
'tr'+'ue'='TRUE'
'to a' acts as a link.
Can you help me to learn more?
(Other definitions for true that I've seen before include "Constant" , "Straight or loyal" , "A false alternative?" , "Straight or correct" , "Corrected" .)