Some stock pine things, periodically stocking gold (9)

'some stock pine things periodically stocking gold' is the definition.
I can't judge whether this definition defines the answer.

'pine things periodically stocking gold' is the wordplay.
'pine' becomes 'long' (to pine for something is to long for it).
'periodically' indicates alternate letters (letters must be selected 'every so often').
'stocking' means one lot of letters goes inside another ('stock' can mean 'carry' or 'contain').
'gold' becomes 'or' ('or' is the heraldic name for gold).
The alternate letters of 'things' are 'hns'.
'hns' going around 'or' is 'horns'.
'long'+'horns'='LONGHORNS'

Can you help me to learn more?