musk deer
麝 refers specifically to the musk deer, an animal known for producing musk.
麝 combines 鹿 (deer) with 射, which likely contributes the sound and may relate to the idea of shooting or emitting musk scent.
A deer (鹿) that shoots (射) out a strong scent: that's the musk deer.
For ジャ, imagine a jar of musk from the deer: jar -> ジャ, and the deer shoots out its scent into the jar.
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civet cat
musk
common thyme (Thymus vulgaris); garden thyme
suni (Neotragus moschatus)
Chinese windmill (species of red-bodied swallowtail butterfly, Atrophaneura alcinous)
musk water; musk scent
muskox (Ovibos moschatus); musk ox
musk gland
sweet pea
sweet pea (Lathyrus odoratus)
musk deer
Asian house shrew (Suncus murinus)