Back again. 5dn Chopping out odd pieces, always fears powerful cutter (5ltrs) l???r - Laser??
6dn Expedition for students if led badly leads to fall (5,4ltrs) f???d ?r?p - something trap
7dn First letter one found in old language, then another one turned up (7ltrs) i???i?l - Initial??
27ac With maximal organisation, temperature falls in it (7Ltrs) t?d?e?t - Tidiest??
Many thanks and explanations would be appreciated. Four Clubs
Laser - alternate letters in always fears
Field trip-anagram of if led + trip(fall)
Initial- i in Latin(language) reversed + i
Tidiest-t(temperature) + dies (falls)inside it