Line of latitude (6)
'line of latitude' is the definition.
(tropic is a kind of line of latitude)
This is the entire clue.
(Other definitions for tropic that I've seen before include "Interzonal line" , "Line of latitude determined by the solstice" , "Line defining hot zone" , "One of two lines" , "Capricorn, say" .)
'line of latitude' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for parallel that I've seen before include "Like" , "'Alongside something, it's all pearl (8)'" , "suggesting inability to make projected meeting" , "Maintaining distance apart" , "bars in gym?" .)
(Other definitions for equator that I've seen before include "Imaginary ring around the earth's centre" , "Imaginary line dividing the earth's hemispheres" , "A circle around earth's centre" , "Line of zero latitude" , "Notional line drawn around the earth" .)