Wordnet 3.0
VERB (1)
1. 
 make free from confusion or ambiguity; 
 make clear; 
- Example: "Could you clarify these remarks?"- Example: "Clear up the question of who is at fault"[syn: clear, clear up, shed light on, crystallize, crystallise, crystalize, crystalise, straighten out, sort out, enlighten, illuminate, elucidate]
WordNet (r) 3.0 (2006):
shed light on
    v 1: make free from confusion or ambiguity; make clear; "Could
         you clarify these remarks?"; "Clear up the question of who
         is at fault" [syn: clear, clear up, shed light on,
         crystallize, crystallise, crystalize, crystalise,
         straighten out, sort out, enlighten, illuminate,
         elucidate]