Polar Christmas tree stocked here (5)

I believe the answer is:

larch

I'm a little stuck... Click here to teach me more about this clue!

'tree stocked here' is the definition.
'larch' can be an answer for 'tree' (I've seen this before). I'm not certain of the 'stocked here' bit.

'polar christmas' is the wordplay.
'LARCH' is hidden in amongst the letters.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for larch that I've seen before include "Deciduous conifer" , "wood" , "Supplier of timber" , "Coniferous tree with deciduous bright green needles" .)

I've seen this clue in The Sun and The Times.

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