The most common and most likely answer to this crossword clue is the 7 letter word SILANES
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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.
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What does SILANES mean?
SILANES noun- Any of a group of silicon hydrides that are analogous to alkanes (the paraffin hydrocarbons); especially the parent compound SiH4
- Monosilane (SiHâ‚„)
- Any organic derivative of monosilane