Rancher's pen is pink, containing hint of red (6)
I believe the answer is:
corral
'rancher's pen' is the definition.
'corral' can be an answer for 'pen' (both are a type of enclosure for animals). I am unsure of the 'rancher's' bit.
'pink containing hint of red' is the wordplay.
'pink' becomes 'coral' (coral is a shade of pink).
'containing' indicates putting letters inside.
'hint of' suggests taking the first letters (the smallest possible amount of the word).
The initial letter of 'red' is 'r'.
'coral' enclosing 'r' is 'CORRAL'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for corral that I've seen before include "Famous gunfight at the OK ..... in American West" , "Ranch pen" , "Pen for livestock (US)" , "Pen for cattle in the US" , "Shorten (book)" .)