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Nine words place G second and L third, and a single verb supplies a third of them.
OGLED, OGLES and OGLER are the same verb taking different endings. O opens three of the nine, and every one of those is an OGLE form.
IGLOO needs no explanation and AGLOW means shining or lit up. Between those two and the OGLE forms, most of this group is covered by words a reader already knows.
An AGLET is the small plastic or metal sheath on the end of a shoelace. It is the kind of word that feels invented until you learn it, and it turns up in puzzles more often than its rarity suggests.
Nine of the nine open with A, O or I. So the first box is a three way choice, about as narrow as an opening gets on this site.
Both mean askew or awry in Scots. AGLEY is the form in Burns's line about the best laid schemes going agley.
Yes, it is an alternative plural of iglu, itself a variant spelling of igloo. IGLOOS is the commoner plural but it runs to six letters.
IGLOO, if a doubled O seems plausible. Otherwise AGLOW, since it tests three letters the OGLE forms do not.