Second person once seen wearing socks in hothouse? (4)
I believe the answer is:
thou
'second person once' is the definition.
(historical second person pronoun)
'wearing socks in hothouse?' is the wordplay.
'THOU' is hidden in amongst the letters.
But, I am unsure how the hidden word is indicated.
'seen' acts as a link.
Can you help me to learn more?
(Other definitions for thou that I've seen before include "You, in olden times" , "Measure" , "Archaic pronoun" , "You (many years ago)" , "once paired with art" .)