The most common and most likely answer to this crossword clue is the 10 letter word CORNUCOPIA
I've seen this crossword clue in Independent
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More clues leading to the result CORNUCOPIA
- Run off opening businesses - very good area for wealth
- Wealth taken from doddery OAP? I concur
- Cereal suitable for children – catch adult stocking one in abundance
- Trouble afoot — temperature’s cold in the Land of More Plenty
- Plenty may come from this
- Abundance of work in CIA supporting company run badly
- Well I never joke over hosting company — one suppresses a lot
- Company moderated our panic, providing an abundant supply
- Garden of Eden Charlie wanted over time, with grass in abundance
- On RUC shifts, policeman reverse of ideal? It shows plenty
Buddy explains!

The straight part
We know that "seed and an ideal place that’s cold for short time (10)" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case seed and an ideal place that’s cold for short time (10) = cornucopia.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CORNUCOPIA mean?
CORNUCOPIA noun- A goat's horn endlessly overflowing with fruit, flowers and grain; or full of whatever its owner wanted.
- A hollow horn- or cone-shaped object, filled with edible or useful things.
- An abundance or plentiful supply.